Siggestions for tuning 300wsm/215hyb ?

Laguna Freak · Sunday at 7:25 PM

cohunt said:
So I've been playing with my 300wsm for a while and I'm trying to fine tune my load as I'm getting occasional flyers in my group size from 1 range trip to the next.

Suggestions are welcome

I've tried rl23 and rl26- I'm getting a bit more speed with the 26 but also about 10fps higher on the ES and more prevalent swipes so if I stuck with the rl26 load I'd really need to back off some and then it would be about the same speeds as the 23 load anyway so I'm gonna stick with the rl23.

Rifle specs-- Barrel is 24"- twist is 1:10- max mag length is 3.120", saami chamber. Redding dies

load right now is Norma brass, cci BR2 primer, neck touched up for even thickness, shoulder bumped 2 thou, factory ammmo fired once, brass annealed, fired again (so I'm working with 2x fired brass)--- rounds are set at 3.075" c.o.a.l. which is .01" jump to lands. - sizing without an expander then using a .307 mandrel. Rl23 @ 63.0gr- speed is right around 2800fps with an ES of 25 and SD of 8- can just barely start to see a faint ejector mark on the brass.

I've shot this with a mb and suppressor and it groups tight with both but I have a slight shift low with the suppressor but not too bad (about 1/2" @ 100y)

I'm getting really good 5 shot groups 1 time to the range .25" @ 100y, then next trip it opens up to .6-.7" @ 100---- i know, neither is anything to bat and eye at but consistency is my goal here. I have not tested this further than 100 yet-- I usually try to dial it in at 100, then go to the "long range" and test it out to 6-700 to verify drops and groups due to range availability.

Maybe it's just me having on/off days?

Factory norma 180 bond strike was 1.5-2"(never checked the speeds, just shot for brass due to the deal i got on the ammo), and I tried a quick and dirty load of rl16 with the 178ahh and it came out with around 1" groups at 3050fps

Sometimes I can account the shift to a "pull" other times it all feels good but groups are larger --when I get the larger groups it's always just 1 shot that opens it up and it seems to be "trip sensitive" , that is it will group well consistently on 1 range trip then open up on a different range trip, then back to tight groups next time-- etc.

I'm using br2 primers, but I also have cci 250, and 215 gmmm primers---

Do you think a primer change might help my ES and "flyer"?
Maybe it's just me?
Any other suggestions?
I don't think I want to increase the bullet jump more as I'd be compressing powder more and don't want to increase pressure at this point.
Cleaning issues? I lightly clean after every range trip but dont "scrub the bore clean"
"Break in issues" I think I'm around 100 rounds down the barrel right now

Maybe I should stifle my ocd and leave it alone and just shoot more.....

You've got a pretty long jump in my experience but I don't shoot Berger. I'm not far into load tuning my 8.5 twist 5R rifled LA 300 WSM with norma brass 210 Accubond at 0.060" jump. I got 0.5 moa with 3 shots @ 65.2, 65.3, 65.4 gr RL23 x WLRM primer and 29 fps ES. Velocity in sequence = 2815, 2844, 2818.

I get similar grouping with 200 Accubond same jump loaded 65.5, 65.6, 65.7 gr RL23, WLRM, yields 12 fps ES. Velocity in sequence = 2835, 2837, 2848.

All of my 30 cal rifles shooting Accubonds and Scirocco II like jump in the 0.060" to 0.073" range so far. Still tweaking the LA 300 WSM.

Last thing, you might try shooting her a little dirtier. I usually don't clean until 15 to 20 rounds. My ocd doesn't let me go longer than that.

hseII · Sunday at 7:44 PM

Beluebow said:
If you are getting faint ejector marks at 2800 I would be hesitant to suggest a starting load. Mine tune between 60.9-62gr depending on the barrel and lot of powder.Mine typically run in the 2870-2940 area.

I also use the same combo of Norma brass and BR2's and or Fed210m's. Fed210m's seem to be the ticket with RL23.

What barrel length are you running with the 2870-2940 fps?

cohunt · Sunday at 7:54 PM

Laguna Freak said:
You've got a pretty long jump in my experience but I don't shoot Berger. I'm not far into load tuning my 8.5 twist 5R rifled LA 300 WSM with norma brass 210 Accubond at 0.060" jump. I got 0.5 moa with 3 shots @ 65.2, 65.3, 65.4 gr RL23 x WLRM primer and 29 fps ES. Velocity in sequence = 2815, 2844, 2818.

I get similar grouping with 200 Accubond same jump loaded 65.5, 65.6, 65.7 gr RL23, WLRM, yields 12 fps ES. Velocity in sequence = 2835, 2837, 2848.

All of my 30 cal rifles shooting Accubonds and Scirocco II like jump in the 0.060" to 0.073" range so far. Still tweaking the LA 300 WSM.

Last thing, you might try shooting her a little dirtier. I usually don't clean until 15 to 20 rounds. My ocd doesn't let me go longer than that.

.010" is a "long jump"? You just said you are running .060" jump --- that's 6x what I'm running--- did you read wrong? Or did I miss a digit in one of my posts

cohunt · Sunday at 7:57 PM

I've got 20 rounds loaded up with a few different lengths and powder drop/primer change--' hopefully I'll get out next weekend to try em out-- also got some adg brass on the way to try too. Might have some norma brass for sale soon

Laguna Freak · Monday at 6:33 AM

cohunt said:
.010" is a "long jump"? You just said you are running .060" jump --- that's 6x what I'm running--- did you read wrong? Or did I miss a digit in one of my posts

LOL! You're right. I read your post as 0.1" jump. That said, "all of my 30 cals like 0.060 to 0.073 jump". Like I said, I don't shoot Berger but it seems I've read a lot of Berger loaders jumping a lot further than 0.01". Admittedly there is a wide range of experience.

I've always found bullet jump to the lands is a good method to time your bullet to barrel harmonics once you have achieved close to your desired charge weight.

Beluebow · Monday at 9:02 AM

hseII said:
What barrel length are you running with the 2870-2940 fps?

Long freebore and 30" barrels.

WAMBO · Monday at 10:42 AM

My 1K BR rifle w/30" barrel really shoots well with 64grs of RL23 under a 215 Hybrid at .025" jump in Norma brass, velocity is 2885 fps.

Sdvldog1371 · Monday at 11:46 AM

I chased kind of a similar issue with my full custom 300 prc. It turned out to be the front 2 scope rail screws were finger tight. The scope rail is bedded to the action so I never noticed gap or flex of any kind.

The only other time I've seen the condition you are writing about is when running at or really close to pressure. You tend to get 2-3 on top of one another and 1-2 just a bit away. That's an indicator that you need to back the charge off.

Also, you're running compressed loads, are you running heavy neck interference or a crimp? You run a heavy bullet in a light interference neck with a compressed load and by shot 3-5, your rounds in the mag, assuming you're magazine feeding, could be several thousandths longer than the first few shots.

One final thought for those who think 0.100 is a long jump. I have a few rifles that were chambered with a long throat, they shoot consistently ¼ minute and jump nearly 0.200", in fact one shoots just under ¼" of jump, 0.233". Scott Satterlee mentioned he tested and found nodes clear out to nearly half an inch. That is heresy on my part, but in my own experience with long throated chambers, there is accuracy at jumps past 0.100".

I'd look at the scope rail and then at backing off your charge slightly. If neither work, try more neck interference...what many call neck tension, or single feed loaded rounds and see if it solves the issue.

skipglo · Monday at 4:05 PM

Unless you have a very large supply of RL powder...you are wasting your time right now...H4350 is probably where I'd be looking or with the N series for longevity....just me

Siggestions for tuning 300wsm/215hyb ?

Laguna Freak

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hseII

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cohunt

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cohunt

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Laguna Freak

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Beluebow

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WAMBO

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Sdvldog1371

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skipglo

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